<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Three.js Material Browser</title>
		<link rel="shortcut icon" href="../../files/favicon.ico" />
		<link rel="stylesheet" type="text/css" href="../../files/main.css">
		<style>
			canvas {
				display: block;
				width: 100%;
				height: 100%;
			}

			#newWindow {
				display: block;
				position: absolute;
				bottom: 0.3em;
				left: 0.5em;
				color: #fff;
			}
		</style>
	</head>
	<body>

		<!-- Import maps polyfill -->
		<!-- Remove this when import maps will be widely supported -->
		<script async src="https://unpkg.com/es-module-shims@1.6.3/dist/es-module-shims.js"></script>

		<script type="importmap">
			{
				"imports": {
					"three": "../../build/three.module.js",
					"three/addons/": "../../examples/jsm/"
				}
			}
		</script>

		<a id='newWindow' href='./material-browser.html' target='_blank'>Open in New Window</a>

		<script type="module">

			import * as THREE from 'three';
			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
			import { RoomEnvironment } from 'three/addons/environments/RoomEnvironment.js';

			const constants = {

				combine: {

					'THREE.MultiplyOperation': THREE.MultiplyOperation,
					'THREE.MixOperation': THREE.MixOperation,
					'THREE.AddOperation': THREE.AddOperation

				},

				side: {

					'THREE.FrontSide': THREE.FrontSide,
					'THREE.BackSide': THREE.BackSide,
					'THREE.DoubleSide': THREE.DoubleSide

				},

				blendingMode: {

					'THREE.NoBlending': THREE.NoBlending,
					'THREE.NormalBlending': THREE.NormalBlending,
					'THREE.AdditiveBlending': THREE.AdditiveBlending,
					'THREE.SubtractiveBlending': THREE.SubtractiveBlending,
					'THREE.MultiplyBlending': THREE.MultiplyBlending,
					'THREE.CustomBlending': THREE.CustomBlending

				},

				equations: {

					'THREE.AddEquation': THREE.AddEquation,
					'THREE.SubtractEquation': THREE.SubtractEquation,
					'THREE.ReverseSubtractEquation': THREE.ReverseSubtractEquation

				},

				destinationFactors: {

					'THREE.ZeroFactor': THREE.ZeroFactor,
					'THREE.OneFactor': THREE.OneFactor,
					'THREE.SrcColorFactor': THREE.SrcColorFactor,
					'THREE.OneMinusSrcColorFactor': THREE.OneMinusSrcColorFactor,
					'THREE.SrcAlphaFactor': THREE.SrcAlphaFactor,
					'THREE.OneMinusSrcAlphaFactor': THREE.OneMinusSrcAlphaFactor,
					'THREE.DstAlphaFactor': THREE.DstAlphaFactor,
					'THREE.OneMinusDstAlphaFactor': THREE.OneMinusDstAlphaFactor

				},

				sourceFactors: {

					'THREE.DstColorFactor': THREE.DstColorFactor,
					'THREE.OneMinusDstColorFactor': THREE.OneMinusDstColorFactor,
					'THREE.SrcAlphaSaturateFactor': THREE.SrcAlphaSaturateFactor

				}

			};

			function getObjectsKeys( obj ) {

				const keys = [];

				for ( const key in obj ) {

					if ( obj.hasOwnProperty( key ) ) {

						keys.push( key );

					}

				}

				return keys;

			}

			const textureLoader = new THREE.TextureLoader();
			const cubeTextureLoader = new THREE.CubeTextureLoader();

			const envMaps = ( function () {

				const path = '../../examples/textures/cube/SwedishRoyalCastle/';
				const format = '.jpg';
				const urls = [
					path + 'px' + format, path + 'nx' + format,
					path + 'py' + format, path + 'ny' + format,
					path + 'pz' + format, path + 'nz' + format
				];

				const reflectionCube = cubeTextureLoader.load( urls );

				const refractionCube = cubeTextureLoader.load( urls );
				refractionCube.mapping = THREE.CubeRefractionMapping;

				return {
					none: null,
					reflection: reflectionCube,
					refraction: refractionCube
				};

			} )();

			const diffuseMaps = ( function () {

				const bricks = textureLoader.load( '../../examples/textures/brick_diffuse.jpg' );
				bricks.wrapS = THREE.RepeatWrapping;
				bricks.wrapT = THREE.RepeatWrapping;
				bricks.repeat.set( 9, 1 );

				return {
					none: null,
					bricks: bricks
				};

			} )();

			const roughnessMaps = ( function () {

				const bricks = textureLoader.load( '../../examples/textures/brick_roughness.jpg' );
				bricks.wrapT = THREE.RepeatWrapping;
				bricks.wrapS = THREE.RepeatWrapping;
				bricks.repeat.set( 9, 1 );

				return {
					none: null,
					bricks: bricks
				};

			} )();

			const matcaps = ( function () {

				return {
					none: null,
					porcelainWhite: textureLoader.load( '../../examples/textures/matcaps/matcap-porcelain-white.jpg' )
				};

			} )();

			const alphaMaps = ( function () {

				const fibers = textureLoader.load( '../../examples/textures/alphaMap.jpg' );
				fibers.wrapT = THREE.RepeatWrapping;
				fibers.wrapS = THREE.RepeatWrapping;
				fibers.repeat.set( 9, 1 );

				return {
					none: null,
					fibers: fibers
				};

			} )();

			const gradientMaps = ( function () {

				const threeTone = textureLoader.load( '../../examples/textures/gradientMaps/threeTone.jpg' );
				threeTone.minFilter = THREE.NearestFilter;
				threeTone.magFilter = THREE.NearestFilter;

				const fiveTone = textureLoader.load( '../../examples/textures/gradientMaps/fiveTone.jpg' );
				fiveTone.minFilter = THREE.NearestFilter;
				fiveTone.magFilter = THREE.NearestFilter;

				return {
					none: null,
					threeTone: threeTone,
					fiveTone: fiveTone
				};

			} )();

			const envMapKeys = getObjectsKeys( envMaps );
			const envMapKeysPBR = envMapKeys.slice( 0, 2 );
			const diffuseMapKeys = getObjectsKeys( diffuseMaps );
			const roughnessMapKeys = getObjectsKeys( roughnessMaps );
			const matcapKeys = getObjectsKeys( matcaps );
			const alphaMapKeys = getObjectsKeys( alphaMaps );
			const gradientMapKeys = getObjectsKeys( gradientMaps );

			function generateVertexColors( geometry ) {

				const positionAttribute = geometry.attributes.position;

				const colors = [];
				const color = new THREE.Color();

				for ( let i = 0, il = positionAttribute.count; i < il; i ++ ) {

					color.setHSL( i / il * Math.random(), 0.5, 0.5 );
					colors.push( color.r, color.g, color.b );

				}

				geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );

			}

			function handleColorChange( color ) {

				return function ( value ) {

					if ( typeof value === 'string' ) {

						value = value.replace( '#', '0x' );

					}

					color.setHex( value );

				};

			}

			function needsUpdate( material, geometry ) {

				return function () {

					material.side = parseInt( material.side ); //Ensure number
					material.needsUpdate = true;
					geometry.attributes.position.needsUpdate = true;
					geometry.attributes.normal.needsUpdate = true;
					geometry.attributes.color.needsUpdate = true;

				};

			}

			function updateCombine( material ) {

				return function ( combine ) {

					material.combine = parseInt( combine );
					material.needsUpdate = true;

				};

			}

			function updateTexture( material, materialKey, textures ) {

				return function ( key ) {

					material[ materialKey ] = textures[ key ];
					material.needsUpdate = true;

				};

			}

			function guiScene( gui, scene ) {

				const folder = gui.addFolder( 'Scene' );

				const data = {
					background: '#000000',
					'ambient light': ambientLight.color.getHex()
				};

				folder.addColor( data, 'ambient light' ).onChange( handleColorChange( ambientLight.color ) );

				guiSceneFog( folder, scene );

			}

			function guiSceneFog( folder, scene ) {

				const fogFolder = folder.addFolder( 'scene.fog' );

				const fog = new THREE.Fog( 0x3f7b9d, 0, 60 );

				const data = {
					fog: {
						'THREE.Fog()': false,
						'scene.fog.color': fog.color.getHex()
					}
				};

				fogFolder.add( data.fog, 'THREE.Fog()' ).onChange( function ( useFog ) {

					if ( useFog ) {

						scene.fog = fog;

					} else {

						scene.fog = null;

					}

				} );

				fogFolder.addColor( data.fog, 'scene.fog.color' ).onChange( handleColorChange( fog.color ) );

			}

			function guiMaterial( gui, mesh, material, geometry ) {

				const folder = gui.addFolder( 'THREE.Material' );

				folder.add( material, 'transparent' ).onChange( needsUpdate( material, geometry ) );
				folder.add( material, 'opacity', 0, 1 ).step( 0.01 );
				// folder.add( material, 'blending', constants.blendingMode );
				// folder.add( material, 'blendSrc', constants.destinationFactors );
				// folder.add( material, 'blendDst', constants.destinationFactors );
				// folder.add( material, 'blendEquation', constants.equations );
				folder.add( material, 'depthTest' );
				folder.add( material, 'depthWrite' );
				// folder.add( material, 'polygonOffset' );
				// folder.add( material, 'polygonOffsetFactor' );
				// folder.add( material, 'polygonOffsetUnits' );
				folder.add( material, 'alphaTest', 0, 1 ).step( 0.01 ).onChange( needsUpdate( material, geometry ) );
				folder.add( material, 'visible' );
				folder.add( material, 'side', constants.side ).onChange( needsUpdate( material, geometry ) );

			}

			function guiMeshBasicMaterial( gui, mesh, material, geometry ) {

				const data = {
					color: material.color.getHex(),
					envMaps: envMapKeys[ 0 ],
					map: diffuseMapKeys[ 0 ],
					alphaMap: alphaMapKeys[ 0 ]
				};

				const folder = gui.addFolder( 'THREE.MeshBasicMaterial' );

				folder.addColor( data, 'color' ).onChange( handleColorChange( material.color ) );
				folder.add( material, 'wireframe' );
				folder.add( material, 'vertexColors' ).onChange( needsUpdate( material, geometry ) );
				folder.add( material, 'fog' ).onChange( needsUpdate( material, geometry ) );

				folder.add( data, 'envMaps', envMapKeys ).onChange( updateTexture( material, 'envMap', envMaps ) );
				folder.add( data, 'map', diffuseMapKeys ).onChange( updateTexture( material, 'map', diffuseMaps ) );
				folder.add( data, 'alphaMap', alphaMapKeys ).onChange( updateTexture( material, 'alphaMap', alphaMaps ) );
				folder.add( material, 'combine', constants.combine ).onChange( updateCombine( material ) );
				folder.add( material, 'reflectivity', 0, 1 );
				folder.add( material, 'refractionRatio', 0, 1 );

			}

			function guiMeshDepthMaterial( gui, mesh, material ) {

				const data = {
					alphaMap: alphaMapKeys[ 0 ]
				};

				const folder = gui.addFolder( 'THREE.MeshDepthMaterial' );

				folder.add( material, 'wireframe' );

				folder.add( data, 'alphaMap', alphaMapKeys ).onChange( updateTexture( material, 'alphaMap', alphaMaps ) );

			}

			function guiMeshNormalMaterial( gui, mesh, material, geometry ) {

				const folder = gui.addFolder( 'THREE.MeshNormalMaterial' );

				folder.add( material, 'flatShading' ).onChange( needsUpdate( material, geometry ) );
				folder.add( material, 'wireframe' );

			}

			function guiLineBasicMaterial( gui, mesh, material, geometry ) {

				const data = {
					color: material.color.getHex()
				};

				const folder = gui.addFolder( 'THREE.LineBasicMaterial' );

				folder.addColor( data, 'color' ).onChange( handleColorChange( material.color ) );
				folder.add( material, 'linewidth', 0, 10 );
				folder.add( material, 'linecap', [ 'butt', 'round', 'square' ] );
				folder.add( material, 'linejoin', [ 'round', 'bevel', 'miter' ] );
				folder.add( material, 'vertexColors' ).onChange( needsUpdate( material, geometry ) );
				folder.add( material, 'fog' ).onChange( needsUpdate( material, geometry ) );

			}

			function guiMeshLambertMaterial( gui, mesh, material, geometry ) {

				const data = {
					color: material.color.getHex(),
					emissive: material.emissive.getHex(),
					envMaps: envMapKeys[ 0 ],
					map: diffuseMapKeys[ 0 ],
					alphaMap: alphaMapKeys[ 0 ]
				};

				const folder = gui.addFolder( 'THREE.MeshLambertMaterial' );

				folder.addColor( data, 'color' ).onChange( handleColorChange( material.color ) );
				folder.addColor( data, 'emissive' ).onChange( handleColorChange( material.emissive ) );

				folder.add( material, 'wireframe' );
				folder.add( material, 'vertexColors' ).onChange( needsUpdate( material, geometry ) );
				folder.add( material, 'fog' ).onChange( needsUpdate( material, geometry ) );

				folder.add( data, 'envMaps', envMapKeys ).onChange( updateTexture( material, 'envMap', envMaps ) );
				folder.add( data, 'map', diffuseMapKeys ).onChange( updateTexture( material, 'map', diffuseMaps ) );
				folder.add( data, 'alphaMap', alphaMapKeys ).onChange( updateTexture( material, 'alphaMap', alphaMaps ) );
				folder.add( material, 'combine', constants.combine ).onChange( updateCombine( material ) );
				folder.add( material, 'reflectivity', 0, 1 );
				folder.add( material, 'refractionRatio', 0, 1 );

			}

			function guiMeshMatcapMaterial( gui, mesh, material, geometry ) {

				const data = {
					color: material.color.getHex(),
					matcap: matcapKeys[ 1 ],
					alphaMap: alphaMapKeys[ 0 ]
				};

				const folder = gui.addFolder( 'THREE.MeshMatcapMaterial' );

				folder.addColor( data, 'color' ).onChange( handleColorChange( material.color ) );

				folder.add( material, 'flatShading' ).onChange( needsUpdate( material, geometry ) );
				folder.add( data, 'matcap', matcapKeys ).onChange( updateTexture( material, 'matcap', matcaps ) );
				folder.add( data, 'alphaMap', alphaMapKeys ).onChange( updateTexture( material, 'alphaMap', alphaMaps ) );

			}

			function guiMeshPhongMaterial( gui, mesh, material, geometry ) {

				const data = {
					color: material.color.getHex(),
					emissive: material.emissive.getHex(),
					specular: material.specular.getHex(),
					envMaps: envMapKeys[ 0 ],
					map: diffuseMapKeys[ 0 ],
					alphaMap: alphaMapKeys[ 0 ]
				};

				const folder = gui.addFolder( 'THREE.MeshPhongMaterial' );

				folder.addColor( data, 'color' ).onChange( handleColorChange( material.color ) );
				folder.addColor( data, 'emissive' ).onChange( handleColorChange( material.emissive ) );
				folder.addColor( data, 'specular' ).onChange( handleColorChange( material.specular ) );

				folder.add( material, 'shininess', 0, 100 );
				folder.add( material, 'flatShading' ).onChange( needsUpdate( material, geometry ) );
				folder.add( material, 'wireframe' );
				folder.add( material, 'vertexColors' ).onChange( needsUpdate( material, geometry ) );
				folder.add( material, 'fog' ).onChange( needsUpdate( material, geometry ) );
				folder.add( data, 'envMaps', envMapKeys ).onChange( updateTexture( material, 'envMap', envMaps ) );
				folder.add( data, 'map', diffuseMapKeys ).onChange( updateTexture( material, 'map', diffuseMaps ) );
				folder.add( data, 'alphaMap', alphaMapKeys ).onChange( updateTexture( material, 'alphaMap', alphaMaps ) );
				folder.add( material, 'combine', constants.combine ).onChange( updateCombine( material ) );
				folder.add( material, 'reflectivity', 0, 1 );
				folder.add( material, 'refractionRatio', 0, 1 );

			}

			function guiMeshToonMaterial( gui, mesh, material ) {

				const data = {
					color: material.color.getHex(),
					map: diffuseMapKeys[ 0 ],
					gradientMap: gradientMapKeys[ 1 ],
					alphaMap: alphaMapKeys[ 0 ]
				};

				const folder = gui.addFolder( 'THREE.MeshToonMaterial' );

				folder.addColor( data, 'color' ).onChange( handleColorChange( material.color ) );
				folder.add( data, 'map', diffuseMapKeys ).onChange( updateTexture( material, 'map', diffuseMaps ) );
				folder.add( data, 'gradientMap', gradientMapKeys ).onChange( updateTexture( material, 'gradientMap', gradientMaps ) );
				folder.add( data, 'alphaMap', alphaMapKeys ).onChange( updateTexture( material, 'alphaMap', alphaMaps ) );

			}

			function guiMeshStandardMaterial( gui, mesh, material, geometry ) {

				const data = {
					color: material.color.getHex(),
					emissive: material.emissive.getHex(),
					envMaps: envMapKeysPBR[ 0 ],
					map: diffuseMapKeys[ 0 ],
					roughnessMap: roughnessMapKeys[ 0 ],
					alphaMap: alphaMapKeys[ 0 ]
				};

				const folder = gui.addFolder( 'THREE.MeshStandardMaterial' );

				folder.addColor( data, 'color' ).onChange( handleColorChange( material.color ) );
				folder.addColor( data, 'emissive' ).onChange( handleColorChange( material.emissive ) );

				folder.add( material, 'roughness', 0, 1 );
				folder.add( material, 'metalness', 0, 1 );
				folder.add( material, 'flatShading' ).onChange( needsUpdate( material, geometry ) );
				folder.add( material, 'wireframe' );
				folder.add( material, 'vertexColors' ).onChange( needsUpdate( material, geometry ) );
				folder.add( material, 'fog' ).onChange( needsUpdate( material, geometry ) );
				folder.add( data, 'envMaps', envMapKeysPBR ).onChange( updateTexture( material, 'envMap', envMaps ) );
				folder.add( data, 'map', diffuseMapKeys ).onChange( updateTexture( material, 'map', diffuseMaps ) );
				folder.add( data, 'roughnessMap', roughnessMapKeys ).onChange( updateTexture( material, 'roughnessMap', roughnessMaps ) );
				folder.add( data, 'alphaMap', alphaMapKeys ).onChange( updateTexture( material, 'alphaMap', alphaMaps ) );

				// TODO metalnessMap

			}

			function guiMeshPhysicalMaterial( gui, mesh, material, geometry ) {

				const data = {
					color: material.color.getHex(),
					emissive: material.emissive.getHex(),
					envMaps: envMapKeys[ 0 ],
					map: diffuseMapKeys[ 0 ],
					roughnessMap: roughnessMapKeys[ 0 ],
					alphaMap: alphaMapKeys[ 0 ]
				};

				const folder = gui.addFolder( 'THREE.MeshPhysicalMaterial' );

				folder.addColor( data, 'color' ).onChange( handleColorChange( material.color ) );
				folder.addColor( data, 'emissive' ).onChange( handleColorChange( material.emissive ) );

				folder.add( material, 'roughness', 0, 1 );
				folder.add( material, 'metalness', 0, 1 );
				folder.add( material, 'reflectivity', 0, 1 );
				folder.add( material, 'clearcoat', 0, 1 ).step( 0.01 );
				folder.add( material, 'clearcoatRoughness', 0, 1 ).step( 0.01 );
				folder.add( material, 'flatShading' ).onChange( needsUpdate( material, geometry ) );
				folder.add( material, 'wireframe' );
				folder.add( material, 'vertexColors' ).onChange( needsUpdate( material, geometry ) );
				folder.add( material, 'fog' ).onChange( needsUpdate( material, geometry ) );
				folder.add( data, 'envMaps', envMapKeysPBR ).onChange( updateTexture( material, 'envMap', envMaps ) );
				folder.add( data, 'map', diffuseMapKeys ).onChange( updateTexture( material, 'map', diffuseMaps ) );
				folder.add( data, 'roughnessMap', roughnessMapKeys ).onChange( updateTexture( material, 'roughnessMap', roughnessMaps ) );
				folder.add( data, 'alphaMap', alphaMapKeys ).onChange( updateTexture( material, 'alphaMap', alphaMaps ) );

				// TODO metalnessMap

			}

			function chooseFromHash( gui, mesh, geometry ) {

				const selectedMaterial = window.location.hash.substring( 1 ) || 'MeshBasicMaterial';

				let material;

				switch ( selectedMaterial ) {

					case 'MeshBasicMaterial' :

						material = new THREE.MeshBasicMaterial( { color: 0x049EF4 } );
						guiMaterial( gui, mesh, material, geometry );
						guiMeshBasicMaterial( gui, mesh, material, geometry );

						return material;

						break;

					case 'MeshLambertMaterial' :

						material = new THREE.MeshLambertMaterial( { color: 0x049EF4 } );
						guiMaterial( gui, mesh, material, geometry );
						guiMeshLambertMaterial( gui, mesh, material, geometry );

						return material;

						break;

					case 'MeshMatcapMaterial' :

						material = new THREE.MeshMatcapMaterial( { matcap: matcaps.porcelainWhite } );
						guiMaterial( gui, mesh, material, geometry );
						guiMeshMatcapMaterial( gui, mesh, material, geometry );

						// no need for lights

						light1.visible = false;
						light2.visible = false;
						light3.visible = false;

						return material;

						break;

					case 'MeshPhongMaterial' :

						material = new THREE.MeshPhongMaterial( { color: 0x049EF4 } );
						guiMaterial( gui, mesh, material, geometry );
						guiMeshPhongMaterial( gui, mesh, material, geometry );

						return material;

						break;

					case 'MeshToonMaterial' :

						material = new THREE.MeshToonMaterial( { color: 0x049EF4, gradientMap: gradientMaps.threeTone } );
						guiMaterial( gui, mesh, material, geometry );
						guiMeshToonMaterial( gui, mesh, material );

						// only use a single point light

						light1.visible = false;
						light3.visible = false;

						return material;

						break;

					case 'MeshStandardMaterial' :

						material = new THREE.MeshStandardMaterial( { color: 0x049EF4 } );
						guiMaterial( gui, mesh, material, geometry );
						guiMeshStandardMaterial( gui, mesh, material, geometry );

						// only use scene environment

						light1.visible = false;
						light2.visible = false;
						light3.visible = false;

						return material;

						break;

					case 'MeshPhysicalMaterial' :

						material = new THREE.MeshPhysicalMaterial( { color: 0x049EF4 } );
						guiMaterial( gui, mesh, material, geometry );
						guiMeshPhysicalMaterial( gui, mesh, material, geometry );

						// only use scene environment

						light1.visible = false;
						light2.visible = false;
						light3.visible = false;

						return material;

						break;

					case 'MeshDepthMaterial' :

						material = new THREE.MeshDepthMaterial();
						guiMaterial( gui, mesh, material, geometry );
						guiMeshDepthMaterial( gui, mesh, material );

						return material;

						break;

					case 'MeshNormalMaterial' :

						material = new THREE.MeshNormalMaterial();
						guiMaterial( gui, mesh, material, geometry );
						guiMeshNormalMaterial( gui, mesh, material, geometry );

						return material;

						break;

					case 'LineBasicMaterial' :

						material = new THREE.LineBasicMaterial( { color: 0x2194CE } );
						guiMaterial( gui, mesh, material, geometry );
						guiLineBasicMaterial( gui, mesh, material, geometry );

						return material;

						break;

				}

			}

			//

			const selectedMaterial = window.location.hash.substring( 1 );

			if ( THREE[ selectedMaterial ] !== undefined ) {

				document.getElementById( 'newWindow' ).href += '#' + selectedMaterial;

			}

			const gui = new GUI();

			const renderer = new THREE.WebGLRenderer( { antialias: true } );
			renderer.setPixelRatio( window.devicePixelRatio );
			renderer.setSize( window.innerWidth, window.innerHeight );
			document.body.appendChild( renderer.domElement );

			const pmremGenerator = new THREE.PMREMGenerator( renderer );

			const scene = new THREE.Scene();
			scene.background = new THREE.Color( 0x444444 );
			scene.environment = pmremGenerator.fromScene( new RoomEnvironment(), 0.04 ).texture;

			const camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 10, 100 );
			camera.position.z = 35;

			const ambientLight = new THREE.AmbientLight( 0x000000 );
			scene.add( ambientLight );

			const light1 = new THREE.DirectionalLight( 0xffffff, 3 );
			light1.position.set( 0, 200, 0 );
			scene.add( light1 );

			const light2 = new THREE.DirectionalLight( 0xffffff, 3 );
			light2.position.set( 100, 200, 100 );
			scene.add( light2 );

			const light3 = new THREE.DirectionalLight( 0xffffff, 3 );
			light3.position.set( - 100, - 200, - 100 );
			scene.add( light3 );

			guiScene( gui, scene );

			const geometry = new THREE.TorusKnotGeometry( 10, 3, 200, 32 ).toNonIndexed();

			generateVertexColors( geometry );

			const mesh = new THREE.Mesh( geometry );
			mesh.material = chooseFromHash( gui, mesh, geometry );

			scene.add( mesh );

			let prevFog = false;

			function render() {

				requestAnimationFrame( render );

				mesh.rotation.x += 0.005;
				mesh.rotation.y += 0.005;

				if ( prevFog !== scene.fog ) {

					mesh.material.needsUpdate = true;
					prevFog = scene.fog;

				}

				renderer.render( scene, camera );

			}

			window.addEventListener( 'resize', function () {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}, false );

			render();

		</script>
	</body>
</html>
